Rotary fan.



No. 763,073. PATENTED JUNE 21, 1904 G. M. RUDD.

ROTARY FAN.

APPLICATION FILED MAR. 24, 1904.

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GEORGE M. RUDD, OF PORT CHESTER, NEWV YORK.

ROTARY FAN.

SPECIFICATION forming part of Letters Patent No. 763,073, dated June 21, 1904.

Application filed March 24, 1904.

To all whom it may concern:

Be it known that I, GEORGE M. RUDD, a citizen of the United States, and a resident of Port Chester, in the county of VVestchester and State of New York, have invented certain'new and useful Improvements in Rotary-Fans, of which the following is a specification.

My invention relates generally to rotary fans, and particularly to the base on which the fan is supported and the mechanism contained therein for oscillating the fan in a horizontal plane.

The object of my invention is to provide a base that will support a fan of any construc-- tion and to provide smooth even running mechanism for oscillating the fan without shock or jar at the extreme points of oscillation.

To enable others to understand my invention, reference'is had to the accompanying drawings, in which Figure 1 represents a fan of ordinary construction attached to my improved base. Fig. 2 is an enlarged sectional view of the base and broken View of the fan-standard through line a, of Fig. 3. Fig. 3 is an enlarged upper plan view of the inside of the base, the oscillating cover being removed, and a broken view of the flexible shaft. Fig. 4 is an enlarged broken view of the vertical oscillating shaft of the base and a broken View ofa modified construction of the fan-support attached thereto.

Its construction and operation are as follows:

The fan shown at Fig. 1 is of ordinary kind, comprising in its construction the blades 1, mounted on the armature-shaft 2, connected with a motor (not shown) within the case 3.

4 is a supporting-standard for the abovenamed parts.

5 is a circular base containing the fan-rotating mechanism, presently to be described.

6 is an oscillating plate or cover for the base, which is situated just out of direct contact with said base.- To this cover is attached the foot 4 of the standard 4 by means of the screws 7. The cover 6 is secured to the ballbearing cone 8, and this cone is secured to the vertical oscillating shaft 9. v

10 is the lower ball-bearing cone, loosely embracing the hub portion 8, of the cone 8. 11 represents the ball-bearings between these cones. The cone 10 is suspended above the bottom of the base by means of its laterallyprojecting curved arms 10, which arms are secured to the base by means of the screws 10 Power to drive the mechanism in the base is transmitted from the armature or motor shaft 2 through the flexible shaft 12 to the worm-shaft 13, journaled in thebase. This shaft carries the worm 14: to register with the worm-gear 15, secured to the hub of the pinion 16, which pinion is journaled on the vertical shaft 9 and is carriedv by the worm-gear in its rotation about said shaft.

17 is a crank-gear rotatably mounted onthe screw 18 and registers with the pinion 16.

19 is a slotted arm having ahole in one end to embrace the vertical shaft 9 and is secured thereto by the screw 20. The free end of this arm carries the bolt 21, adapted to be adjusted in the slot 19 of the arm 19, and is secured therein in any of its adjusted positions by means of the nut 22.

I 23 is a link pivotally supported at one end to the screw 21 and at the other end to the screw 24:, inserted in a threaded hole in the eccentrically located hub 25 of the crankgear 17. a i

As before mentioned, the object of my invention is to provide mechanism for oscillating the fan without shock or jar at the extreme points of oscillation, so that when the fan has been horizontally rotated to one extreme of its travel there will be no shock or jar when the return movement begins. To accomplish this, I have arranged continuousrunning gearing-that is, the gears run continuously in one directionand the only part of the mechanism that reciprocates is the vertical shaft carrying the slotted arm and the top plate, to which the fan is secured. Therefore as the gears do not change motion or alternately throw in and out of mesh all shock and jar incidental to such change is entirely obviated. As the rotary motion of the motor is positive, so, too, is the gearing in the base.

The dotted positions shown at Fig. 3 represent the two extreme positions of the arm 19, and as said arm moves in unison with the fan, as before mentioned, it Wlll show the minimum travel of said fan with the bolt 21 at the extreme outer end of the slot 19. The maximum travel can be attained by setting the bolt 21 at the extreme inner end of said slotted arm. The worm-shaft 13 rotates in the direction of arrow 5, the worm-gear 15 in the direction of arrow 0, and the gear 17 in the direction of arrow cl. When, therefore, the screw 24, traveling with the gear 17, reaches the position A, it will represent the extreme throw or travel of the arm 19 in one direction, and when said screw arrives at a diametrically opposite position it will represent the other extreme throw or travel of said arm. 7

Most of the fan-supports are adapted to be secured to the oscillating plate or cover 6; but as they have no well-defined footby which they can be so secured and are only provided with the shank or support 4: and its threaded end 4, Fig. 4, then this threaded end can be screwed into a threaded hole in the upper endof the central vertical shaft 9.

As before mentioned, the above-described base is applicable to support any description of rotary fan, and by the change of oscillatory motion effected through the arrangement of continuously-running gears the wearing qualities of the mechanism is greatly enhanced. V

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a fan, a motor, a motor-shaft and a support for the same, of a base to which said support is adapted to be attached,said base having mechanism for horizontally oscillating said fan,comprising a vertical oscillating shaft centrally located with respect to said base, a worm-gear carrying a pinion both of which are adapted to rotate about said shaft, a shaft carrying a worm to register with said gear, a flexible shaft for transmitting motion from the motor-shaft to said worm-shaft, acrank-gear registering with the pinion carried by said worm-gear, a slotted arm secured to said vertical shaft, a link connecting said arm with said crank-gear so as to impart an oscillating motion to said vertical shaft through the medium of the continuous-running gears, for the purpose set forth.

2. The combination, with afan, motor, m0- tor-shaft and flexible driving-shaft, of a base, a vertical oscillating shaft carryingthe cover of said base on which the fan is supported, a

worm-shaft connected with said flexible shaft,

a worm on said shaft, a worm-gear journaled on the vertical shaft of the base and carrying a pinion, a crank-gear registering with said pinion, a slotted arm secured to said vertical shaft, a link connecting said arm with said crank-gear so that, through the medium of the continuously-running gearing, link and arm, the fan is horizontally oscillated, for the purpose setforth.

3. A fan-base, an oscillating vertical shaft central therewith, a cover for said base secured to said shaft, ball-bearing support for said cover, worm-gear and pinion journaled on said shaft, a worm registering with said gear, a crank-gear located outside of said oscillating shaft, an arm secured to said shaft,

March, A. D. 1904.

GEORGE M. RUDD. Witnesses:

GEORGE W. FINN, A. L. ADAMs. 

